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Sati [7]
2 years ago
7

What is the mass of an atom with 15 protons, 13 neutrons, and 14 electrons?​

Chemistry
1 answer:
GalinKa [24]2 years ago
4 0

Answer:

Silicon (Si)

Explanation:

Add the protons and neutrons mass to get the nucleus mass. Then you get number 14 and 28. looking at the periodic table we can see this matches silicon's atom mass and electron number

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Potassium and bromine combine to make KBr. What is the name of this compound?
makkiz [27]
The name is Potassium bromide.
4 0
3 years ago
Read 2 more answers
Jack has a rock. The rock has a mass of 14 g and a volume of 2 cm3. What is the density of the rock? * 0 7 ml O 28 g/cm3 07 g/cm
jeyben [28]

Answer:

The answer is

<h2>7.0 g/cm³</h2>

Explanation:

The density of a substance can be found by using the formula

density =  \frac{mass}{volume}  \\

From the question

mass of rock = 14 g

volume = 2 cm³

The density of the rock is

density  = \frac{14}{2}  \\

We have the final answer as

<h3>7.0 g/cm³</h3>

Hope this helps you

3 0
4 years ago
What is the oxidation number of Ni in NiO
galben [10]

Answer:

+2

Explanation:

Nickel (II) oxide, or NiO, is an ionic compound. Recalling a few rules of determining the oxidation number of substances:

1. Oxidation numbers of elements in ionic compounds are usually their own ionic charge

2. The total oxidation number of a neutral compound should be 0

And,

3. The oxidation number of oxygen in most cases is -2.

Therefore, since O in NiO has a oxidation number of -2, and nickel (II) ion usually has a charge of 2+, the oxidation number of Ni in NiO is +2 (always remember to put the positive sign in front of the number)

4 0
4 years ago
Calculate the concentration of each species in a 0.240 m c6h5nh3cl solution.
amm1812
The solution for this problem is:
C6H5NH3Cl is a strong salt: C6H5NH3+ + Cl- C6H5NH3+ + H2O <-----> C6H5NH2 + H3O+ 
K = Kw/ Kb= 1.0 x 10^-14 / 3.8 x 10^-10= 2.6 x 10^-5 

=2.6 x 10^-5 = x^2 / 0.240-x 
x = [H3O+] = 0.00251 M 
pH = 2.60 is the concentration
8 0
3 years ago
What gas is stored in gas cylinders? <br>​
Igoryamba

Answer: Oxygen, Nitrogen, And Nitrous Oxide

Explanation:

Oxygen, Nitrogen, And Nitrous Oxide Are Just Some Of The Gasses Stored In Gas Cylinders,

4 0
3 years ago
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